About model and data exchange with 3rd party solutions: Revit, Solibri, dRofus, Bluebeam, structural analysis solutions, and IFC, BCF and DXF/DWG-based exchange, etc.
I want to import some CAD file into Archicad for further revision. Whatever the AutoCAD files are linked or merged into Archicad, the character "±" is shown as “?" in Archicad.
Different from import, there are no problems for exporting "±" from Archicad to Autocad.
To organize the drawings in AutoCAD is terrible. I just want to import those into Archicad for my further revision, addition, organization, and publishing. All the things could be easily done with the Archicad's Drawing Manager.
Have you try to convert the file from autocad 2010 format to 2004 or less?
I have an issue with 2010 format file, Hatches are badly import, but Conversion to 2004 fix it.